Microsoft has forged a strategic partnership with China United Telecommunications (China Unicom) for co-operation in CDMA (code division multiple access) wireless data services. A memorandum of strategic partnership was signed in Beijing by Microsoft chairman Bill Gates and China Unicom president Wang Jianzhou yesterday, making the United States software giant the latest foreign firm to secure a place in the world's largest mobile phone market. Under the agreement, the firms will develop value-added services for the advanced CDMA 1X platform of China's No 2 mobile carrier. The platform will use Microsoft's .Net technology, its framework for Web services and component software and programming language environment. Microsoft has committed to assisting China Unicom's mobile content and application providers to jointly develop more than 100 types of applications and services based on a CDMA 1x wireless data platform. The companies refused to reveal financial details of their pact. Microsoft has experienced only limited success in pushing the adoption of its Stinger handset operating system but by teaming up with China Unicom it hopes to gain acceptance in the world's largest mobile phone market. Separately, Mr Gates yesterday signed an agreement with the China Information Technology Security Certification Centre allowing China controlled access to the Windows source code and other technical data. Mr Gates briefed President Jiang Zemin on the Government Security Programme. Centre director Wu Shizhong said: 'Microsoft's GSP provides us with the controlled access to source code and technical information in an appropriate way. Microsoft has taken a great step forward to let us understand its product security.' Microsoft signed similar security deals with Russia, Britain and Nato last month.